Island



C. KNOWLES AND H. U. TANNER.

GRINDING MACHINE.

APPLICATION men MAY 8. 191a.

Patented Dec. 9, 1919.

2 SHEETS-SHEET 1.

MAY 00 3 44401.,

C. KNOWLES A1 0- H. D. TANNER.

GRHVDING MACHINE APPLICATXGN FILED MAY 8. 191a.

Patented Dec. 9,1919.

2 SHEETSSHEET 2.

AMM/Q p at .Jforuthe r I v UNITED STATES PATENT OFFICE.

CARROLL KNOWLES. F CBANSTON. AND HUBER'I. D. TANNER, 0F PROVIDENCE,RHODE ISLAND, ASSIGNORS TO BROWN AND SHARPE MANUFACTURING COMPANY, OFPROVIDENCE, RHODE ISLAND; A GOBIPORATION OF RHODE ISLAND.

GRINDING-MAQHIN Providence, respectively, both in the county I ofProvidence and State of Rhode Island, have invented certain new anduseful Imrovements in Grindino -Machines; and we do hereby declare thefollowing to be a full. clear, and exact descri tion of the invention,such as will enable 0t ers skilled in the art -to which it appertainstomake and use the same.

The invention relates to grinding ma chines which are adapted forgrinding cylindrical or tapered work, and more particularly to the meansfor supporting and driving the grinding wheel of machines of this t viliegrinding wheels of universal machines of'the'. above type are usuallsupupon a head which is carrie' upon 1% wheel slide, and may be adjustedeither an larly or both. an larly and longitudijia lyz with relationereto, the slide being I 'oimtedto move longitudinally upon a swivel.which is adjustablymoiinted on the machine frame. It is one objectofthe resgait!invention to provide a novel belt rive inding wheel ofsuch a machine wmcn w u enable thewheel to be driven -from a pulleymounted in the machine frame,.and preferably at one sideand somemwhatbelow the wheel head, and which will automatically maintainasubstantially uniform tension on the belt during all move- '1 ments andadjustments of the wheel head. To this end the forward and return runsof the driving belt are passed over guide pulleys arranged to permit theadjustments and movements ofthe wheel head, and one or more of which areso connected with the wheel head that the requisite motion istransmitted to such pulley or pulleys from the head to maintain thenormal belt tension whenever the head is moved in making any of theadjustments. for which the machine'is adapted, or in effecting the crossfeed of the grinding; wheel slide. This insures the proper action of thebelt without requiring special adjustn'ientor manipulation of the beltguiding pulleys, and without the use of spring or weight operatcd takeuppulleys; The belt gu ding pulleys are prefer 8pecification of LettersPatent.

"acco panying drawings Patented Dec. 9, 1919.

Application filed May 8. 1918. Serial No. 233.235.

in adjusted position on the slide. To this end means are provided forsecuring the wheel head directly upon the slide which will ermit theadjustment of the head both angui nates the platen on which the head hasbeen adjustably mounted in prior machines having the same range ofadjustment. The means for time securing the wheel head on the slidepreferably consists of a rin surrounding a circular base on the hea andadjustably secured on the slide by clamping devices which clamp both thering" and the wheel head to the \v el slide. The features of theinvention will be readilyderstood from an inspection of the tail on line5-5, Fig. 2.

The machine shown in the drawings is provided with a reciprocating worktable :2.

a' swivel table 4 mounted thereon. and provided with-ways (i on whichthe head-stock and tail-stock are adjustably mounted. these parts beingconstructed-and operated in any usual manner.

The grinding wheel 8 is secured on the end of a grinding wheel shaft 10which is mounted in suitable bearings carried by the grinding wheel head12. The Theadds pro vided witha cylindrical haseli which rests upon theupper surface of the" grinding wheel slide 16 and is s ured. in ositionan the slide icy three clamping devices which arly and longitudinally.This elimiand the following detailed description of the n'iechanismillusembrace the base and are longitudinally adjustable on the slide. Asshown, each clamping device comprises a disk 18 arranged to overlie theprojecting flange of the base, and a bolt 20, the head of which isarranged to engage. one or the other. of

. the head and rests upon the upper surface of the wheel slide.

The clan'iping bolts 20 pass. through holes in the ring, and theclamping disks 18 rest upon the heads of bearing screws 28 which projectabove the surface of the ring and are substantially 'in the plane of theflange on the wheel head which is engaged by the disks. Thisconstruction is simple and compact, and enables the wheel head to bereadily and conveniently adjusted either angularly or longitudinallyupon the wheel slideand to be quickly and securely clamped in adjustedposition.

The wheel slide is mounted to move longitudinally on'ways formedon thewheel slide base 29, and is actuated by the pinion 31 secured to theupper end of a shaft 33 and engaging a rack on the slide. The shaft 33is operated through cross feed mechanism which may beof any usualconstruction. The wheel slide base 29 is mounted for angular adjustmentupon the machine frame, and is held in adjusted position by clampingbolts 35, the heads of which engage an angular T-slot 37 formed in thebase. i

The grinding wh'eel shaft is driven through a belt .30 which passes overa pulley 32 on the shaft and over a driving pulley 34 which ismounted inthe machine frame, and is preferably located at one side and below thegrinding wheel head, as shown. The forward and return runs of the beltpass over guide pulleys which are so mounted and arranged with relationto the driving and wheel shaft pulleys that they permit the adjustmentsand feeding movements of the wheel head. and some or all of which arerelatively moved during such adjustments or movements to automat callymaintain the belt tension. These guide pulleys are also preferablyarranged to lead the belt to and from the wheel shaft pulley laterallyover the wheel head. In the preferred construction shown, the drivingpulley is an elon- .lgated pulley or drum along which the belt may moveas occasion requires, and the forward run of the belt passes from thedriving' pulley up over a guide pulley 36, the

axis of which is at an angle to the axis of erally over the wheel headto a vertical guide pulley 38 which is mounted on thewheel head, andwhich again changes the plane and direction of travel of the belt. theguide pulley 38 the belt passes over the horizontal driving wheelpulley, and thence to a vertical guide pulley 40 mounted on the headdirectly below the pulley 38, which acts like the pulley 38 to changethe plane and direction of .the return run of the belt. From the pulley40 the belt passes in a siibstantially horizontal direction laterallyover the wheel head to av guide pulley 4:? arranged above thedrivingpulley 34, withits axis at an angle to the axis of the drivingpulley, so that the plane and direction of travel of the belt'is changedand the belt is directed down about the drivingpulley.

The guide pulleys 36 and 42:are mounted in the pulley brackets 44 and46, which are pivotally supported in vertical bearilrgsr18 and 50'in asupport 52 so that the pulleys may swing to accommodate themselves tovariations inthe direction of travel ofathe belt passing .over them. Thesupport. 52 in which the pulley brackets are. mounted is arranged tomove longitudinally of the pulley 34: to compensate for variations; inthe positions of the guide pulleys 38 and .40 and the wheel shaft pulley32 incident to adjustments or movements of the wheel head. Asshown, thesupport'iscarried upon the upper end of a swinging lever 15 1 to whichthe support is pivotally. connected by a shaft 56 secured in lugs 58atltheupperx end ofthe lever, and engaging bearing li-i'gs 60 on thesupport. v

To automatically maintain the belt ten-' 'sion during the movements oradjustments of-the wheel head, the support for the guide pulleys 36 and4:2 is so connectedwitlrthe head that the requisite movement is impartedto the pulleys from the headwhenever the head is moved oradjusted..Means is alsopreferably provided. for positivelyj maintaining the guidep lley 42 for the re-; turn run of the'belt. in proper alinement withthe belt leadingv from the pulley lf) on the wheel head. As shown, themeans: for accomplishing these results comprises a rack bar 62 connectedwith the pulley support 52 and pulley bracket 46, and engaged by a scgment (i l secured to the wheel head and'haw ing its pitch surfacesubstantially in line with the surfaces of the guide pulleys 38;

pulleys 39 .and40 are mounted. The rack From - which engages an annulargroove in the rod.

The sleeve 76 forms one section of a telescoping shaft, the othersection of which consists of arod 80 fitting within the sleeve andhaving its rear end secured to the pulley bracket 46. By means of therod 80, sleeve 76 and rack bar 62, the guide pulley 4:2 is

maintained in alinement with the belt leading from the pulley 40,whatever the position of the wheel head.

The connections between the rack bar 62 and the pulley support 52comprises a sleeve 82 which is connected to'the sleeve 7 6 by a'pivotbolt. 84, and is connected with;

the pulleysupport' 52 by a rod 86. The rear end of the rod is connectedwith the pulley support by a pivot bolt 88, and the forward' cnd of therod fits within the sleeve 82 and is connected therewith by an adjustingscrew 90.- A hand wheel 92 is secured on the forward end-of theadjusting screw so thatfflier-screw may e conveniently turned .t e gu dto adjust the distance between pulle' s36 and til-and the pulleys 38 andon ,-J t e' wheel head, and thus secure the proper'helt'tension;Thrdugh" he connections described the positively moved'by;,.movement' ofthewhee head to maintain'the belttension, The connections betweenjtherackbar 62 and the pulley s'upsrysez-srs so arranged and proportioned 40that thei:novemen'ts mparted to the guide pulleys 36 and 42 when; thewheel head is moved or adjusted will cofiipensate for the movement ofthe guide "p eys 38 and 40, and will also compensate for the variation45 in the wrap of'the' beltabout the pulleys 38 and 40 incident to suchadjustment or movement. I

While it is preferred to employ the specific construction andarrangement of, parts 50. shown and described, particularly in embodyingthe invention in a universal inding machine similar to that illustra inthe drawings, it will be understood that this construction andarrangement is not assemtial to the broader features of the invention,

and maybe varied and modified as found desirable or best. suited to theconstruction and arrangement of the parts in the machine in which it isto be embodied.

Having explained the nature and object of the invention, and"specifically described one form of mechanism in which it may be em:bodied, what is claimedistl. A grinding machine, having, in.combination, a grinding Wheel head, a Wheel .the head," a wheelsliaauigularly adjustable, a base on. whic justable, a driving pulleyxnounted ra ity .ofg'uiding pulleys'irranfed to ,and

shaft having a pulley thereon. mounted in the head, a longitudinallymovable wheel slide on which the head is angular-1y adjustable, adriving pulley mounted inthe -machine frame, a driving belt passingover, 76

the driving and wheel shaft pulleys, guide pulleys for the forward andreturn runs 6f" the belt arranged to permit the adjustment and movementofthe grinding wheel head, and connections for mov-ingone or more ofsaid guide pulleys from the head to automatically maintain the belttension whenever the head is moved or adjusted. 2. ,A grindingmachine,-having, in combination, a 4 grinding wheel head, a wheel shafthaving a pulley thereon mounted in :the head, a longitudinally movablewheel slide on which the head is aiigularly adjustable, a driving pulleymounted to. rotate o'n a fixed axis in the machine frame, a drivingbeltplrssing over the; driving and wheel shaft pulleys, guide pulleysfor tlie sion ,whene'yer the head is moved onged 1 justed. if r 3. Agrinding'machine, havin' in' com bination, 'a grinding: wheel h'ea aiwh' shaft having a puIIeHEthereonincunted d e on which wheel slide i si-l ngitudinall movab frame on which the base augulu'lframe, adrivingbelt psB8i1ig'.over-'th in and grinding wheel'pulleys'andthe beltlaterall over theQ-hea 105. for 'automatical y operating one or more-of.the pulleys to properly guide the butane 1* to maintain the belttensionwhene ilf'ifll head is moved or adjusted. I l T 4. A grindingmachine, hav-ih ,.in combination, a grinding wheel head, a wheelshafthaving a p'iille'y thereon mounted in the head, a longitudinally movablewheel h slide on which the head is ungularly adjustable, a drivingpulley n minted in the ma- {15 chine frame, a driving bdlt passingoverthe driving and wheel shaft'pulleys, two guide I pulleys on the headback-of the wheel' shaft pulley each arranged to change the'plane? andthe direction of travel of the-belt, two guide pulleys at one side ofthe head over which the belt passes from the pulleys on the head to thedriving pulley, and conneetionsbetweenthe latter two guide pulleys andthe head through which the pulleys are .moved to maintain the belttension whenshaft having a pulley thererm mounted in 130 longitudinallyofv the driv ng pulley and connected to be moved by the head to maintainthe belt tension whenever the head is moved or adjusted.

(3.. A. grinding 'machiiun having. in eom- 'bination. a grinding wheelhead. a wheel shalt having a pulley thereon mounted in the head. alongitudinally movable wheel slide on which thehead is-angularlyadjustable, :1 driving pulley mounted in the machine frame, a drivingbelt passing over the driving and wheel shaft pulleys, two gi'lide.pulleys atone side ot the head arranged with their axes at varyingangles to the axis of thedriving.pulley to change the plane anddirection of travel of thebelt' leadingfro1n the driving pulley oversaid pulleys, t.\vo

guide pulleys at the rear of the wheel shaft over which thebeltleads ina substantially hor zontal .direction from the. former guide pulleys andarranged witlrtheir axes substautially normal to the axisof" the wheelshaft pulley to changethe, plane and direction of travel of the belt,andineans-for automatically changing the. relative .positions of thepulleys tomaintain the belt tension' .wheneve1; the head; is; moved or nadjuste-d.

.'. Z. ;'1 L .-grindiiig machine, having, in combinat1on,a grindingwheel head, a wheel shaft having apulley; thereon mounted in'. the head,a longitudinally movable wheel slide on. which the head isangularlyadjust-,-

able, a driving pulley mounted inthe machine frame. a driving beltpassing over the .driving and wheel shaft pulleys. two guide pulley-"son the head with their axes substantially normal to the axis of thewheel shaft, a segment having its pitch surface substantially coincident.with the surfaces of the pulleys. a rack bar engaged by the segment,and guide pulleys connected with the rack "bar over which the beltpasses from the pulleys on the head to the driving pulley.

8. A grinding machine. having, in combination. a grinding wheel-headmwheel shaft havinga pulley thereon mounted in thehead, a longitmhnally.n'iovable wheel slide on which thehead is angularly adjustal'ile, a

driving pulley mounted in the machine frame, a driving belt passing overthe driving and whecl shaft pulleys, tw -guide pullcys on the head the,axes of which are substantially normal to the axis of the wheel shaft,t\'voguide pulleys over which the belt 'vices for clampin passes fromthe pulleys on the head to the driving pulley, a support movablelongitudinally' of the driving pulley on which the.latmguide pulleys arepivotally supported", and a connection between the head and one of saidpulleys for maintaining saidpulley in aliuenient with the belt passingover it,

J. A grinding machine, having, in comb-i nation, a grimlmgwheel;l1ea(l,a wheel shaft having a pulley thereon mounted in the head,

a longitlnlinally moyable wheel- 'slide olr which-the head is angularly-a( ljustable,..- a driving pulley mounted in .the machine; frame, adriving belt passingover the :driv ing and wheel shaftpulleys,:-twofiuidepulleys on the head the axes-of Whic [,fll'G-SlllJ-Wstant-ially normal to the axistof'theaihcel-.80

shaft. two guide pulleys over which the hell; passes from the pulleys onthe.headstoithe,

driving pulley, a support- Zior saidiplllleys movable longitudinally.of: the ..(lriving.;,pul-

ley, a rack bar connected;to,said supportgand a .seginent sec fredtothe' head-engaging said racltbar'. 4

10. A grinding machine,having;incombination, a. grinding wheel head, .aie'c l shaft having apullcy the head, a longitudinallyi movable, wheelslide on .which the heattisgangularly;agll lsti able, :1.driv'ingizpullev mountedlg-nv theyinachine frame, alrivingbelt.passingove the driving and wheel. shaft. .pulleys, twopulleys on the healhgu id; :pulleysove the belt passes froinsaid.pulleysjo theid' ing pulley, andaneanslfoe-relati g .pensate" for:theanovement of the, leys on the head and-for the variatiopjlnthe wrapof the belt about saidpulleys.

' 11. Agrindingmachine.having, in, coinhi nat1on,a-wheel shde,:agrindlng-wvheel-hexul. having a cylindr cal .hase- -1'cst1ng -.,-.0n:1,the ,;-106

slide. a grinding. :wheel. shaft, in. theihe'ad, and clampingdevices-m'erlyln the .l'iasemnd,

, adjustable longitudmallvgoli'jtlie slide.

' 12. A grinding machine..ha ving; incombi-l.

nati0n,a wheel .slide. a grindingiwheel;hea d.,110

having a cylindrical base restingon-t-he slide, a grinding wheel shaft;in the..hea d..a-1:ing plate surroundi lag. the; bases and, adjustablelongit-lulinally of the slide, and clamping dejusted positions 13. Agrinding machine.having, m LCOIIIbF nation. a wheel slide, agrimlingwheel head having a cylindrical basc'resting onithe slide, T-slotsextending;longitudinally of.l20

the slide, a ring plate surromu-lingfthe base, clamp disks .overlying'the 'li: \sc.,;an d' ring, and clamping bolts passii 1g through thedisks and ring and engaging theT.-sl0ts.

CARROLL KNOWLES. HUBERT D. TANNER.

to com; .ude,,.pul-

g the rn g-and base iu,.a,d 116

